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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1aac19d40f2cea642cda803361e9505a5a34d0975cfeb1282a8b1ebd9cc242' 
  AND token = 'CRye7h+WOZ1tmue1zhTZZSOxz0AVQS7wTQmj/eK3K9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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