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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84db74016b91340ffc69426f5b5f07a8eff579471a2ad81275d1738d02653ba0' 
  AND token = 'dgzTfHtT+GEJr69Z74HAofski4KgA+0DenpEMcTdjso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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