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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800f7e92b1eb0f95103fe69920668260c8f36c01a6ae203a9bf990f770526a0a' 
  AND token = 'ns5SsQY8KsB7S/onyXDopncEItUoe6gGL3WzTPeF/tA=' 
  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"
    }
  }
}