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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ce54d1884fc7e25936022dc6ca3ff97beea576ba85740b19b5b3dfeaa043fbd3' 
  AND token = '8cYdP0SLRNcoOadeFIC7QXtKYQGrCaD1cn3MNF2wZps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00849

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}