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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d0d3bad72e51f23326edec2ce22200054db9b91ad6b1127c2f17f9ee5d944a' 
  AND token = 'uDU/Wf6zEK3rWbs7hStIy3T962DKWynp9w2c7iXaf0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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