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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67801dc257cc37463d4d310c3bdcd48be1c728ea7f7ab6aec4e00ebc6b2e116b' 
  AND token = 'Cc/58lqASPsv/FucGlia0WVdLVEXO6vDV+D35mzKqTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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