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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68198a0e746006bd03710c270337e218c15020876a7ec761f10e79d9cb23e512' 
  AND token = 'U3drPxCJiIYN7rYRDN/2WyIKO2ps8lQzghl+J6ekTlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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