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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48cf53f6e582028ccb6c622f53a6495e7d552f167b7c6cf5b4a8a782298fdb6' 
  AND token = '4atY70V+gE6iYvJXNBB9ponOMI54Scd2vrva37a6CLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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