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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c834f0303207bd23e425fb00e12cc3a9d6a29cc3c3f09718842178494769de' 
  AND token = 'HMtWs+AgMKydT4G0I8fuXf9D1wOIFlmlqhbUujdCwNk=' 
  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"
    }
  }
}