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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '30027dbdb711474865a6673a38ac9893390740a2e7cc0807671cb5d23d008e4a' 
  AND token = 'dQ2FHUeuRA+GUjqcFlzx3P20WHsJ+kOo9+1Z4oXmzjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00851

JSON explain

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