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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4084881e3096c29438b6c44abb776eaf06c60dd2e66fa762dbfb84555eeb0105' 
  AND token = '5x0eg77Xs+f0oIAuEf/YPBkWbTljRhcRcMw8mXHxPKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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