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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abef5f0e2af221f1c50aa4eeb6dd9a516fbeb45400e27a70eb89481d062c2953' 
  AND token = '/DCIvwUR917e43ynq+jlUfcuf0UeFJ1hlvuJDVnxx6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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