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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d25718748c77250d8d4750fe0574bc870a266dff2f5e6de424775222a48acd' 
  AND token = 'bt8/bMo0hcz355BLXnAA5eggqy3j/3oDIoa96HzI/qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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