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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3a912d988e5919a00a7abd0d34d312da5fdfc3a8aac2c752256d4b9a0eea23' 
  AND token = '/HjVXQIgbeqnn/EX2w7rSklXHyH4p9jR/NLFmsljIBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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