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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10d0f66f6b257547f12b0d209909134421013a633eba94b3a965210aa07dd28' 
  AND token = '0Wu8Ev2EgLyk0Gl90QUliN7scsZB+ftU+nk3708BovQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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