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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158fe048cc30c32f5e14e8496fc944760bde69e616c57a8c539ab00aec12efcc' 
  AND token = 'Y2Q7TvRlaGzJG4z333QKpUuX3X4it3eb9EKoZSReD60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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