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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a29d3f5c78097ec3a9762ade0904f96bb271f34e95f003ec26548d64f03b6d' 
  AND token = 'tCsQRIXm0myGqD4yutg7S7iL21jH9Zoz38S7EkH+Irk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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