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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d21c1d7a715239accdcbef925ba6de4f3f7e2c17b143c7b9f1bb5b2b84a90dc' 
  AND token = 'eJFfglut4n9PrKxVDgSV6CtDEjjSyOxDgAvbDJgtPco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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