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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a8d964306c0b835343da9c2b9546a6ca8206f77642c0f61f2ea95e6889e6a3' 
  AND token = 'QlheknWk4GYYuCgNvCjSUHrKyxtrE4Dea7C4vWNPZHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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