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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b62f815b73146372bdec83150767640d1b76a63701ee1251ebaa7466df7dd96a' 
  AND token = 'Bi0ICFdnMapjabqfEXW3HL4GqaoZBuv/YacvHRO2dmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01457

JSON explain

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