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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075d730650819dc10eeb0e54ebd5185be7b3418563ce13d3c2f6d54acf268b9e' 
  AND token = 'pjF+JoX2SwlU88mojr7ZPINFo0HPWb1cn1ZH7flr6cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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