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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2917cf375a33141ed5236da82f0bfbebe0074f61fee81b86de37c88b6931e375' 
  AND token = 'REaWkKVNTbNqgIkXbzlE8h4NeM29iCfTyXTmElVzh7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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