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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866a48ae1d8a6d8c583f85bcbac36b2c441ecdfcc7c3e7e0a53a4f449be3e454' 
  AND token = 'qw72vylvJbTadsNvvVv2R9/mMSY+gF7TLAa4CUfYwuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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