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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487f062e8b833ca8322d40efbe3973126a2f0c8d077386217e6501c656cb03a4' 
  AND token = 'r72xJSFgK71kdH4xYfLj1IdqV3FWqH48TqxDgQBigho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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