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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8a311e1f5aa0c3ff0a92ee806d11cfe057a7d5ad038fc783e826e6c6348b3c' 
  AND token = 'u22D8nKENZnGdPCVqStXPkRR9vfnmM5UqGEKJ3tm0Ok=' 
  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"
    }
  }
}