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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1439e818df85b43d3c5865f6282f8ce6e3248cec9561061b3357afb56a6d813f' 
  AND token = 'ZU02Z2taguD6CfGGn8bwifQhmR6KFSmA4zGtqOrfcHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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