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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2704b02c636dc551f2350cf3999445d3ebb83480bed0b186d67935ab9a0e54' 
  AND token = 'yaY9bPJVaCNV/EWDX1z70Z2dqE7vTMvrBk9vBAQ5Xtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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