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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1df91a352e6e2226892935a4d8dd9cfd829b5841262806934ad7e369ef4b61d' 
  AND token = 'jKS9f9maNAmh5atQDilkvn8ZHFf8l3XdBvBaZMOE/mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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