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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974883a9d0a1c588d844af121d4e3ceff7fc115666a28f82417f4273b3533068' 
  AND token = 'luuXtvPUp2mwM7f52mnsRoyRmdTh2oxi5AFalVDLeVU=' 
  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"
    }
  }
}