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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fae2005c3ea847dae328767bcb4b9210db3e9440639adf74a58e0477b1533c' 
  AND token = '89yB09H0lTLJ25DCzI6g/CypT0gR3S6YODltHxSC1TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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