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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e58b88a490c94aa36108d32ce9df5d091f396b5d55e77000c6472f83cb5f5c9' 
  AND token = '/f+7l5Df2WGFrfKU2OjTLcYsZ0JAz5t4Edu/qXe5Vf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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