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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac482fa9774e17d6863cd3c6c7f78bc88e44327b63427a49885e6dc4d3b5966' 
  AND token = 'W3aYUpIeU+XQS5TwZLFwxeaTVyISQIkl3Km/34kvK68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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