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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be533aec0cbfc83dfde9b4a8c9e6609c03295a73eb19f60b35762cbd06bb9fb' 
  AND token = 'O4/Yv0ECh4ottml/xIInFT7HEzobDtHyOqI3fA2tRus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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