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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b1facfedb53c69df5c5045c9a86caa43b1dc555cae2eaf52bed8bbf7b8d6fc' 
  AND token = 'blRXYKLfaWEg0kyN1eiqRi1kCILPes9GwD75C8pkuOM=' 
  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"
    }
  }
}