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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8814e28e68c0e2b157540cb9f8a00b33ea8d2bccee87a5930adcc752c00afaff' 
  AND token = '6LM4kIkiVxkiPJtexeO94loMUgwt0PnuS6VZfdlhyIY=' 
  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"
    }
  }
}