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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400c28cecda33c321acc3d5f7b6f6a234103e349d90ea9d852db11e69ff88516' 
  AND token = 'X+6zSoUcm6y8hBIiaT4V8JkG81QPQWVZklokT1768RI=' 
  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"
    }
  }
}