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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ecce69df23c6607ce4e1ebcb2ab1d05db2a201ecf140107a2f16fb38bcd9a645' 
  AND token = 'r7Ccr07LZOtapqW7D2dD5rJq1jw0rkiarWsP6vWZeD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00816

JSON explain

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