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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d234684a331ecf173faca7a978aa0ff562656ac8d2b73c6f6986d2901b072' 
  AND token = '4f5CtjFHHzRhGRXW6N9C7+6skMikIM7UY0eO6xSRedg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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