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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af056fb879d6432092d93dd2b0f06a8f1e77bc0dcc0586290e5b5f19ef09afc6' 
  AND token = 'QCo9ZxYDff+wHigA4VHv2A62ohFYWkvPxLgiGlhfCbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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