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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f769fc67e9fddc1b93d2fbdd1bdfc48019f1faf3efa9cd6746b7bee391d75a' 
  AND token = '1g1eIX2v5ZdYbc0zjWbbmShevzPA3QW/NdBs23k4K54=' 
  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"
    }
  }
}