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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5110e5eb1ee1b2d10c34db55c40e94053993cc8f68f793f110a119cbd54e878a' 
  AND token = 'Vg8k3gH7KJYA3eTx7/6UupORE9d6sgX0giY5ms/OVBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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