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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57223b04ff69a9b93ad688f72749fc6cd156b4e48f6e084f3d0c9151fb2a67a' 
  AND token = '+Dm/1mIg00kcx3qb26e0+uXL3N8bqHGsFPnTucgDxio=' 
  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"
    }
  }
}