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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520e67fb4901daba34c0705f0f9fa955bc23501041afc29259e3acef4877337f' 
  AND token = 'rGTT8fWL5I/fVVLQcOYTyqGXxkcQcG87wNSdZPjCen0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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