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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e6b015c9ca7a0e01f056d9b41513ea4bf96453398041d2e0027dea80e5e3ff' 
  AND token = '2o/QTg1CuhnlvMBRYalhA9l+40UVC9IiVB/ngee/lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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