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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd618e3bc0a8c696a8a695cc472142a219e986375c3539c1de553c40ad89435b0' 
  AND token = 'Sc0DC+NcTUSh2cw4KoBLHVTesx8c/gFeH1LbXmjCcUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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