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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d70974235908546ad2c6151c349f21eae6c52d4fba3bf2a39e38c09180761a' 
  AND token = 'D0f80GtEWbUpbHGtpiqQhf+PCNmjdFmfC014emK4Rwg=' 
  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"
    }
  }
}