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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60396328fdbf4a93901bbf008def3af072958ae0de52b4fe7988e1d8fb2ffc0d' 
  AND token = 'Ylr/F9UWISHNd7THnHom4d95v/FLsFL9eICZDPKFD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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