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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350f630472451c35a76d2df0c6e87d725485a3fea9485da3104b7054c893539f' 
  AND token = 'T98WcoAPZpK/opTarlHgoTJeGIdN3nni/mz4AXhf3BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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