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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950968deca04503d85160670df4ad8960c92586971fd7ab6db34a298fc8ab491' 
  AND token = '4o7zqjY0LNtIULs50mj7aoe7/CR+r6FzZN6xbipjnL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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