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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1aa397a8d24a16f089651dd817254b8e14cd96c833751f3f8d6d2c6b621109' 
  AND token = 'o9WFQ96317WnrEYMszclKenFTsKMGn+rSHwdtBd7otI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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