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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36bf2dc70ec657b3a33ecde02a947d602562d26087d35c0d487a1b4eeca0c23' 
  AND token = 'iYWRU82wZUj1phOOF8KUPlZ7hkfjiz0YMUGR3pTPh3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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