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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43313d46ec1f30aa393234948a7bbaa0942d859d521974c6d32287a16f605ee1' 
  AND token = 'jledqxUTFhApdfgsq29u4EIGmivTyRrIGQxSW5uzPbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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