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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b439348d076724c8e48005de28a55aaac7567de7e27ded9bd3675c46384f7c95' 
  AND token = 'TwmH0N+W9vR6hAx8bXco/sAxVRggV+GqphLO+teCjSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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