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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f0d2d8c56e4beeea9ffe0ecadc0dde03bda7c944a53283c7ac50e0c8afa490' 
  AND token = 'rItpw0LORNJOStyS1UmLTeefppJTHpgEx1FvyhnKJdY=' 
  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"
    }
  }
}