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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdce575d2331e58f560f1ca56cd4ef5f9f2ef924c9a8ac4a16b1d57615e0e7f9' 
  AND token = 'ldBXUBkEH/Ge/waDMuaGZ/hGdqadfZ+7735+5Zl6sB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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