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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3173b4008e3d5de909f493bab6a5ecf0e63326ab56a81f10465e2f377e63a89' 
  AND token = 'ETtbiJr9nJOLDdO33K7GaIwgRLvwWzaqt4S5zueyjAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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