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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e2d5f2ddc1e6c5fc290b2622de66e8ce505c44d5c28d140d80eb84f6ef9ee7' 
  AND token = 'OsMbUVGsusrZ4SU6gOOupsD1w1VNYto0GRxWKb0L6Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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