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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8948e2a2b7de286cf48a2dc8c4524185edc34fa46756b42ec01292ecf4851cd0' 
  AND token = 'scq2/S9ytQi0NzRxCYVEgGv4afqSBU3S3+5pnUEVyus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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