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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdf9ceae758c7f3da60e4442e7c214e7a6557a0851dc3bcb428e4d1f473bce4' 
  AND token = 'xoausM8l7rr4YEV0Hc9VdbW7/FfpMEr6fQ+OtgZDZdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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