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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0595f3d08d23d75dfb1fc0a0e401be99edc13c4e72f04cf11e732a54f34121b0' 
  AND token = 'lPVrkc1NMAvnxEzZ/Cp+MBojvBiF7Q3A8lDzlAIF5Lo=' 
  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"
    }
  }
}