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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19b703a38ef63d4b7043430e14103a26f0bc921eff8014249cf5141db30cde4' 
  AND token = 'B+B9s89RccOHI1IM2/KHaLvM6oIk2HuUlNbb3b9DvDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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