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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33c329b6c3a5de51c3f7eb1aaa569617aed4e85211a0f30ab374540b4aeb4e0' 
  AND token = 'X0XP6xQ7HT5uxvms+N/kvvQ82KLV4fjUZ7YJO2GaIlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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