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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b988035b8c1b1f4d64643b47c305631b215b6cf4545e60ceafac73dc386c53' 
  AND token = 'JvYszbRM/t97Ayc7dFhlZdgEcT2DTk5m0VAqVVYqn2A=' 
  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"
    }
  }
}