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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43dc46c9bf741668d344a39a5b7d4a6860ca8c441ae8969fe5d2c2cf87ae4d6b' 
  AND token = 'bgyKN5NA1kHGHlxA5aVI3ZDiaqYotDmwMOX0qB9kgpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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