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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bfd29f5b7ff9df12e622886e0f8feab0e39d7175d5f646a655310007687751' 
  AND token = 'KBp6wEqxZK3mE50UzJmJ7H4mZru629u/1M9PrqwQ2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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