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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eee9e9967c30ece1fb2990620dddc0799b8f28fc08111a88d5ff4df2291e3a0' 
  AND token = 'FT58Cs6Unkz1Xvw2YEgGog8wBeibVE28znqkNCChvPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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