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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'df5295d337e3fa8c1a921990562844f77dd6bf989f71de967a7ae2fe8ae8ff27' 
  AND token = 'hZjhGPmdTOrdRNwHERdNbIoQ11uPsi0gC0Wv+I+t+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00898

JSON explain

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