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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ec821880f7b24c3b5b4035aff9aae826bb40792f6ea30b60d81d66f8d498ae' 
  AND token = '9e02jhhhaLCeAvQM3zmExCeuqRE42redLFDJHrN+Tto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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