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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e92356f94c1ef20692717faa7e8c2f550b5ad304fb6e0f0e3e83438f952de06' 
  AND token = 'jVAiQy/FaNNMTcPnquuAV5ZpbAKzxmgRmjkvvDg4rSE=' 
  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"
    }
  }
}