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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030e2b342f26852e879fd5469750fed0ba86b0084583115b47586d86ec645198' 
  AND token = 'EUnHa5FBMCUEswVv++IibmoG1et4Exx1oxd1nATYoQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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